煤炭开采板块8月20日涨0.68%，安源煤业领涨，主力资金净流出2.57亿元

Group 1 - The coal mining sector increased by 0.68% on August 20, with Anyuan Coal Industry leading the gains [1] - The Shanghai Composite Index closed at 3766.21, up 1.04%, while the Shenzhen Component Index closed at 11926.74, up 0.89% [1] - Anyuan Coal Industry's closing price was 6.68, reflecting a 6.37% increase, with a trading volume of 970,300 shares and a transaction value of 638 million yuan [1] Group 2 - The coal mining sector experienced a net outflow of 257 million yuan from institutional investors, while retail investors saw a net inflow of 56.08 million yuan [2] - Major stocks in the coal mining sector showed varied performance, with Yanzhou Coal Mining Company and China Shenhua Energy receiving significant net inflows from retail investors [3] - The trading data indicates that while some companies like Anyuan Coal Industry faced net outflows from institutional investors, others like Shaanxi Coal and Chemical Industry experienced net inflows from speculative funds [3]